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Oviduct Contractility and Egg Transport in the Rabbit

From the Departments of Gynecology and Obstetrics and Physiology of the Wayne State University School of Medicine, Detroit, Michigan.

The contractile activity of the oviductal musculature was monitored in restrained, conscious rabbits. A pressure receptor was developed to transfer pressure fluctuations from the oviductal lumen to a pressure transducer connected to a preamplifier and a series recorder. Egg transport was evaluated by segmental flushing of contralateral oviducts. Rabbits were autopsied at 36, 48, and 72 hours postcoitum (PC), and the pattern of motility of one oviduct was correlated with the location of eggs in the contralateral oviduct. At 36 and 48 hours PC, when the majority of eggs were trapped in the oviduct, the oviducial musculature exhibited an active pattern with remarkable variability in the resting pressure. At 72 hours PC, when the majority of eggs were in the uterus, there was a stable pattern of oviductal motility with no variability of the resting pressure.